linux-kernel - Re: [PATCH] ARM: dts: use vqmmc-supply of emmc/sd for exynos4412-odroid-common

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Message-id: <55DFBE08.9090603@samsung.com>
Date:	Fri, 28 Aug 2015 10:48:56 +0900
From:	Jaehoon Chung <jh80.chung@...sung.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	linux-samsung-soc@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Kukjin Kim <kgene@...nel.org>
Subject: Re: [PATCH] ARM: dts: use vqmmc-supply of emmc/sd for
 exynos4412-odroid-common

On 08/27/2015 09:26 PM, Krzysztof Kozlowski wrote:
> W dniu 27.08.2015 o 18:29, Jaehoon Chung pisze:
>> Currently vmmc's property is wrong.
>> If it needs to control two supplies, then it has to use vmmc/vqmmc-supply.
>> (Card supply power and I/O Line supply Power.)
>>
>> Signed-off-by: Jaehoon Chung <jh80.chung@...sung.com>
>> ---
>>  arch/arm/boot/dts/exynos4412-odroid-common.dtsi | 7 ++++---
>>  1 file changed, 4 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
>> index ca7d168..4ddabfd 100644
>> --- a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
>> +++ b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
>> @@ -461,10 +461,10 @@
>>  &mshc_0 {
>>  	pinctrl-0 = <&sd4_clk &sd4_cmd &sd4_bus4 &sd4_bus8>;
>>  	pinctrl-names = "default";
>> -	vmmc-supply = <&ldo20_reg &buck8_reg>;
>> +	vmmc-supply = <&ldo20_reg>;
>> +	vqmmc-supply = <&buck8_reg>;
> 
> Shouldn't this be reversed? LDO20 has 1.8V and it goes to MMC connector,
> so it should be VQMMC?

If my schematics is right thing, buck8 is used LAN card power.
I will send after removing buck8_reg. how about?
Anyway, Thanks for pointing out. :)

I don't know who this regulator applied. I have guessed that it used for eMMC.
Sorry for guessing.

Best Regards,
Jaehoon Chung

> 
> In the same time I can't find on schematics where BUCK8 goes...
> 
> The SDHCI_2 node below looks good.
> 
> Best regards,
> Krzysztof
> 
>>  	mmc-pwrseq = <&emmc_pwrseq>;
>>  	status = "okay";
>> -
>>  	num-slots = <1>;
>>  	broken-cd;
>>  	card-detect-delay = <200>;
>> @@ -485,7 +485,8 @@
>>  	bus-width = <4>;
>>  	pinctrl-0 = <&sd2_clk &sd2_cmd &sd2_cd &sd2_bus4>;
>>  	pinctrl-names = "default";
>> -	vmmc-supply = <&ldo4_reg &ldo21_reg>;
>> +	vmmc-supply = <&ldo21_reg>;
>> +	vqmmc-supply = <&ldo4_reg>;
>>  	cd-gpios = <&gpk2 2 0>;
>>  	cd-inverted;
>>  	status = "okay";
>>
> 
> 
> 

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